`import WASILibc` is unavailable in Embedded Swift for WASI

[MaxDesiatov]

Description

Even though we're building Swift stdlib with WASI-libc for Embedded Swift, apparently its modulemaps aren't supplied in the Embedded Swift SDK

Reproduction

import WASILibc

Expected behavior

This module should be available when building with Embedded Swift SDK for WASI

Environment

swift-DEVELOPMENT-SNAPSHOT-2025-08-02-a_wasm-embedded

Additional information

No response